Pulley.



IUQKTENTBD OUT. 20, 1903',

G; P.- GONNBR.

. PULLEY. APPLICATION FILED JAN. 19, 1903.

N0 MODEL.

ZZ/ZL'tnes's as: In 2) 6 2110 602 e /onzzez.

NrrED STATES Patented October 20, 1903.

PATENT OFFICE.

PU LLEY.

SPECIFICATION formingpart of Letters Patent No. 741,889, dated October 2( 1903.

Application filed January 19,1903. erial No. 139,723. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE F. CONNER, a citizen of the United States, and a resident of the city of Port Huron, in the county of St. Clair and State of Michigan, have invented new and useful Improvements in Pulleys, of which the following is a full, clear, and exact specification.

This invention relates to pulleys, and especially to those adapted to receive comparatively short wide belts and to drive them with a minimum slip and air-cushioning.

In pulleys of the usual type, where the face is crowned, the belt is strained at its center, owing to the greater diameter of the pulley at that point, and in passing around small pulleys which are close together the belt becomes unduly worn and soon gives way, as there is constant lateral motion in the particles.

The object of this invention is to provide a pulley wherein the belt is equally strained and worn alike.

Referring to the drawings, Figure l is a vertical View in section through a pulley which embodies the principal features of my invention. Fig. 2 is a viewshowing the action of a belt running over pulleys.

In the drawings, A represents the hub of a pulley, connected by a web memberato a rim a in the usual manner. The outer face of said rim for the main portion of its diameter is turned to a true cylinder, .whose periphery a may afford a belt-seat. As herein shown, and preferably in pulleys of small diameter, a ring of composition metal, rawhide, or leather B is secured to this face by means of cement, rivets, or any other suitable means. Between the edges of the cylinder-face a and the margins of the pulley-rim the pulley-face is cut away or rabbeted, as shown.

When in use, a belt 0 is employed whose width is somewhat greater than the effective width required, and consequently greater than the width of the cylinder-face a or the ring B. When in position, the margins of the belt 0 alone do not touch the pulley, while the main strain of the driving comes on the portion of the belt which passes around the cylindrical rim. As a consequence the inner portion of the belt is stretched uniformly, whereas if the pulley were crowned the belt would be worn unevenly, being drawn most at the center and thence with decreasing strain, the particles of the belt moving laterally backward and forward toward the edges. When the belt tends to run ofi in either direction, the unsupported margin on the outer or convex edge of the belt (see dotted lines in Fig. 2) is tightened, thereby increasing the friction and resistance as the belt rounds the pulley, while the concave margin slacks. Thus the center of strain is momentarily shifted and the belt center tends to follow it, thus resuming its proper position.

I claim as my invention- A pulley having a solid rim, the middle portion of whose face is a plane cylinder raised above the marginal portions, and a pulley-facing covering said middle portion.

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

GEORGE F. (BONNER. Witnesses:

D. E. PURDY, O. R. STIGKNEY. 

